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Other assets and other liabilities - Other Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Other Assets And Other Liabilities [Abstract] |  |
Deferred compensation | $ 2,261 | $ 1,718
Accrued payroll | 35,827 | 16,517
Mortgage buyback reserve | 5,928 | 3,529
Accrued interest | 6,772 | 6,465
Derivatives | 48,242 | 17,933
Deferred tax liability | 0 | 20,490
FHLB lender risk account guaranty | 6,183 | 5,546
Reserve for unfunded commitments | 16,378 | 0
Other liabilities | 42,809 | 15,256
Accrued expenses and other liabilities | $ 164,400 | $ 87,454

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